Add subscribe stub (with hardcoded url)

cic_tools/eth/runnable/subscribe.py

@@ -0,0 +1,21 @@
+import json
+
+import websocket
+
+ws = websocket.create_connection('ws://localhost:8545')
+
+o = {
+    "jsonrpc": "2.0",
+    "method": "eth_subscribe",
+    "params": [
+        "newHeads",
+        ],
+    "id": 0,
+        }
+
+ws.send(json.dumps(o).encode('utf-8'))
+
+while True:
+    print(ws.recv())
+
+ws.close()

requirements.txt

@@ -12,3 +12,4 @@ pysha3==1.0.2
 hexathon==0.0.1a2
 eth-abi==2.1.1
 eth-keys==0.3.3
+websocket-client==0.57.0